Description
Cathedral Stone Heavy Duty Cleaner is a powerful, ready-to-use gel cleaner specially formulated to remove heavy black carbon, atmospheric staining, dirt, and embedded grime from masonry surfaces. Its thick gel formula clings to vertical and overhead surfaces, giving you excellent control and longer dwell times without running or dripping.
Best Used On
- Brownstone
- Brick
- Concrete
- Sandstone
- Unpolished GraniteÂ
This cleaner is ideal for historic restoration, building exteriors, and heavily soiled masonry where standard cleaners are not strong enough.
Key Benefits
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Effectively removes severe black carbon and deep-seated stains
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Gel consistency stays in place on vertical surfaces
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No VOCs – safe for users and the environment
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Ready to use with no mixing required
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Made in the USA
How to Apply
Apply to a Surface Saturated Dry (SSD) substrate using a brush, roller, or sprayer. Allow the product to dwell for 5 to 45 minutes depending on the severity of the staining. Important: Never allow the cleaner to dry on the surface. If it begins to dry, lightly mist with water to keep it active without washing it off. After the dwell time, thoroughly rinse the surface using a pressure washer on a low setting for best results.
Coverage Rates (per 5-Gallon Bucket)
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Rough / porous surfaces: 80–120 sq ft
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Smooth / non-porous surfaces: 350–400 sq ft
Important Guidelines
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Always prepare a test mock-up first and record the dwell time that works best for your substrate.
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Protect surrounding areas (especially aluminum, glass, and plants) with plastic sheeting, as the cleaner can damage these surfaces.
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Do not use in freezing temperatures. Product should not be allowed to freeze.
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Read and follow all manufacturer instructions before use.
Cathedral Stone Heavy Duty Cleaner delivers professional-grade cleaning power while remaining safe and environmentally responsible — making it a trusted choice for masonry restoration professionals and historic building projects.
Data/Installation Instructions
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